If your overall goal is to enjoy yourself, we need to understand where your enjoyment comes from. From what you said, your primary motivation for playing is to "show that you're not utter garbage at everything." In other words, you want to be good at the games.
Right now, you're obviously not feeling that way. You have a few options going forward:
-Get better at the games, and keep playing them
-Don't get better at the games, and keep playing them
-Stop playing them
The second option is not going to work for you. If your motivation is to feel like you're good at the games, playing on easy mode is not going to do it for you. There are a couple of reasons for this. In gaming, I've found that beating games can bring enjoyment in two ways. It can either be a personal achievement, where you feel good because it was hard for you personally, or it can be impressive to others (or some combination). If you got visceral pleasure from achieving an easy 1CC, we wouldn't be having this discussion, so I doubt easy 1CCs count as personal achievements. As for impressing others, easy 1CCs are not impressive. Again, they are worth doing if you personally find them to be challenging and worthy goals, but we both know an easy mode 1CC is not impressing anyone else.
What about the first option then? Well, if you challenge yourself to improve, you can start taking on the higher difficulties of the game. Beating higher difficulties will DEFINITELY feel like a personal accomplishment, and even a normal 1CC is starting to edge into the territory of "impressive" for a lot of people. This, I think, is the toughest option, but the one that will make you happiest. You will have to put the thought out of your mind that it is "the game's fault", or "the resource systems are broken", or "it's RNG's fault that you died". Even if those things are true, they're not going to help you achieve your goal. These are games we're talking about. Your mindset needs to be "what can I improve to better my chances of winning?" If you don't have that mindset, you will lose.
What about the third option? Well, if getting better doesn't appeal to you, and you really just can't bring yourself to enjoy the games, then quit. There's no shame in doing so. At the end of the day, we are trying to convert time into dopamine in the most efficient way possible. If Touhou does not make you happy, then quit.